Search Publications
JWST Imaging of Edge-on Protoplanetary Disks. I. Fully Vertically Mixed 10 µm Grains in the Outer Regions of a 1000 au Disk
Duchêne, Gaspard; Wolff, Schuyler G.; Perrin, Marshall D. +6 more
Scattered light imaging of protoplanetary disks provides key insights on the geometry and dust properties in the disk surface. Here, we present James Webb Space Telescope (JWST) 2–21 µm images of a 1000 au radius edge-on protoplanetary disk surrounding an 0.4 M ⊙ young star in Taurus, Two Micron All Sky Survey (2MASS) J04202144 + …
Cloud–Cloud Collision and Cluster Formation in the W5-NW Complex
Tej, Anandmayee; Liu, Hong-Li; Liu, Tie +5 more
We present a detailed structural and gas kinematic study of the star-forming complex W5-NW. A cloud–cloud collision scenario unravels with evidence of collision-induced star and cluster formation. Various signatures of cloud–cloud collision such as "complementary distribution" and "bridging features" are explored. At the colliding region, the two …
Investigating the Star-forming Sites in the Outer Galactic Arm
Sharma, Saurabh; Verma, Aayushi; Kaur, Harmeen +7 more
We aim to investigate the global star formation scenario in star-forming sites AFGL 5157, [FSR2007] 0807 (hereafter FSR0807), [HKS2019] E70 (hereafter E70), [KPS2012] MWSC 0620 (hereafter KPS0620), and IRAS 05331+3115 in the outer Galactic arm. The distribution of young stellar objects in these sites coincides with a higher extinction and H2<…
Cluster Formation in a Filamentary Cloud: The Case of the Stellar Cluster NGC 2316
Sharma, Saurabh; Panwar, Neelam; Verma, Aayushi +7 more
We present a multiwavelength analysis of the star cluster NGC 2316 and its surroundings. We estimated the physical parameters of the NGC 2316 cluster, including its shape (elongated), size (R cluster = 0.4 pc), distance (1.3 ± 0.3 kpc), and minimum reddening (A V = 1.55 mag). We discovered two massive stars (B2.0V-B1.5V, ag…
Far-ultraviolet to Far-infrared Spectral Energy Distribution Modeling of the Star Formation History across M31
Hopkins, Andrew M.; Leahy, Denis A.; Hansen, Jakob
Our neighboring galaxy M31 has been recently surveyed at the far- and near-ultraviolet (FUV and NUV) with the UVIT telescope on AstroSat, which provides unprecedented sensitivity to young stellar populations. Here the UVIT data are supplemented with optical data, near-infrared (IR) data (Spitzer), and mid- and far-IR data (Herschel). The observati…
Electron Density Distribution in H II Regions in IC 10
Lebouteiller, Vianney; Ramambason, Lise; Jackson, James M. +7 more
We present the [O III] λ52 µm map of the dwarf galaxy IC 10 obtained with the Field-Imaging Far-Infrared Line Spectrometer on board the Stratospheric Observatory for Infrared Astronomy. We combine the [O III] λ52 µm map with Herschel and Spitzer observations to estimate the electron density distribution of the brightest H II regions of…
The Strength of the Sheared Magnetic Field in the Galactic's Circumnuclear Disk
Lopez-Rodriguez, Enrique; Chuss, David T.; Guerra, Jordan A. +2 more
Recent high-resolution 53 µm polarimetric observations from SOFIA/HAWC+ have revealed the inferred plane-of-the-sky magnetic field (B-field) orientation in the Galactic center's circumnuclear disk (CND). The B-field is mostly aligned with the steamers of ionized material falling onto Sgr A* at large, differential velocities (shear). In such …
The Panchromatic Hubble Andromeda Treasury. XX. The Disk of M31 is Thick
Bell, Eric F.; Dolphin, Andrew E.; Williams, Benjamin F. +6 more
We present a new approach to measuring the thickness of a partially face-on stellar disk, using dust geometry. In a moderately-inclined disk galaxy, the fraction of reddened stars is expected to be 50% everywhere, assuming that dust lies in a thin midplane. In a thickened disk, however, a wide range of radii project onto the line of sight. Assumin…
The HH 24 Complex: Jets, Multiple Star Formation, and Orphaned Protostars
Yen, Hsi-Wei; Comerón, F.; Bally, J. +9 more
The HH 24 complex harbors five collimated jets emanating from a small protostellar multiple system. We have carried out a multiwavelength study of the jets, their driving sources, and the cloud core hosting the embedded stellar system, based on data from the Hubble Space Telescope, Gemini, Subaru, Apache Point Observatory 3.5 m, Karl G. Jansky Ver…
Metallicity-PAH Relation of MIR-selected Star-forming Galaxies in AKARI North Ecliptic Pole-wide Survey
Hashimoto, Tetsuya; Jeong, Woong-Seob; Hwang, Ho Seong +9 more
We investigate the variation in the mid-infrared spectral energy distributions of 373 low-redshift (z < 0.4) star-forming galaxies, which reflects a variety of polycyclic aromatic hydrocarbon (PAH) emission features. The relative strength of PAH emission is parameterized as q PAH, which is defined as the mass fraction of PAH particle…